On 24/03/10 8:41 AM, Alejandro Cabrera Obed wrote: > Dear all, I have an Asterisk SIP server in a LAN environment and I want > your opinion in order to decide the use of an audio codec: > > What audio codec is better, G.711a or G.711u ??? Which suites to my LAN > voip calls ???
It basically comes down to where the system is being used and what codecs you're using upstream. G.711a is aLaw and G.711u is uLaw. uLaw is predominantly used in the USA. aLaw is used in most of the rest of the world (although I think Japan might use uLaw). If you're using an ISDN card then it will be talking aLaw or uLaw depending on where you are. The idea is to avoid transcoding - i.e. converting between one format and another. So, if you're using a VoIP provider instead of ISDN, it will depend on what they're using. If your VoIP provider is outside of the US and accepts aLaw, then that's likely what you want to use (bear in mind that they might still use an upstream provider who uses G.729 etc). Easiest option is to just choose aLaw or uLaw based on your country. -- Cheers, Matt Riddell Managing Director _______________________________________________ http://www.venturevoip.com/news.php (Daily Asterisk News) http://www.venturevoip.com/exchange.php (Full ITSP Solution) http://www.venturevoip.com/st.php (SmoothTorque Predictive Dialer) -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
